Replace dirs with dirs-next dependency (#1361)

`dirs` will be unmaintained for the foreseeable future, so
switch to the maintained fork `dirs-next`.

Closes #1319.

Cargo.lock

@@ -301,20 +301,20 @@ dependencies = [
 ]
 
 [[package]]
-name = "dirs"
-version = "2.0.2"
+name = "dirs-next"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13aea89a5c93364a98e9b37b2fa237effbb694d5cfe01c5b70941f7eb087d5e3"
+checksum = "1cbcf9241d9e8d106295bd496bbe2e9cffd5fa098f2a8c9e2bbcbf09773c11a8"
 dependencies = [
  "cfg-if",
- "dirs-sys",
+ "dirs-sys-next",
 ]
 
 [[package]]
-name = "dirs-sys"
-version = "0.3.5"
+name = "dirs-sys-next"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e93d7f5705de3e49895a2b5e0b8855a1c27f080192ae9c32a6432d50741a57a"
+checksum = "9c60f7b8a8953926148223260454befb50c751d3c50e1c178c4fd1ace4083c9a"
 dependencies = [
  "libc",
  "redox_users",
@@ -1121,7 +1121,7 @@ dependencies = [
  "byte-unit",
  "chrono",
  "clap",
- "dirs",
+ "dirs-next",
  "gethostname",
  "git2",
  "log",